PSU Overload?

[Sargent Mustard]

Hi guys. I just upgraded my rig with another 280x in the last few days.

Here are my complete specs:

CPU:Intel i5 2500k @ 3.3Ghz 

Cooling: CoolerMaster Hyper 212 EVO 

MB: MSI Z77A-G45 

GPU: Sapphire R9 280X TOXIC + Sapphire 280X Vapor-X OC 

RAM: 8Gb G.Skill Ripjaw @ 1600mhz

Storage 1: Samsung 840 120gb SSD 

Storage 2: Seagate Barracuda 2Tb HDD 

PSU: Corsair CX 750M  

Case: Corsair Carbide 400R.

 

Ran a couple of benchmarks in Heaven 4.0, everything seemed fine, scores of around 2200 at the Extreme preset. Temps were good, CPU at 50C and GPU1 at 75. Was playing around in Sleeping Dogs with all the settings cranked up to max. Then my PC suddenly shut off, like somebody had pulled the plug. It then booted up like normal. This is the second time this has happened although I suspect the first time was due to high CPU temps.

 

Because I have 2 high-consuming cards (not just any ol' 280X) , could it mean that my PSU can't handle them? 

[Nico123473]

probably, check this out and look for your GPU, you would at least need 800watts,